Hi All,
I am finalizing a clocked circuit design. I need to actually implement a clock signal and I was hoping to get some guidance on selecting appropriate components for the clock.
Requirements:
Minimum Frequency (3x max input signal frequency): 2MHz
Maximum Frequency (slower than worst case propagation delay path + setup time): 18MHz
Nominal Frequency: 10MHz - seems reasonable but open to discussion
Voltage: 5V CMOS (driving clock inputs of CD74AC175 and CD74AC109), I think?
Fanout: Qty. (11) CD74AC175 + Qty (3) CD74AC109
I see these are crystals (XTAL) and oscillators (OX XO). It seems like everything I have read points me to use an oscillator, but when I go look at Digikey to pick one, they are crazy expensive ($10-200 each). What am I missing here? What is the best design for this part of the circuit?
-Mike
I am finalizing a clocked circuit design. I need to actually implement a clock signal and I was hoping to get some guidance on selecting appropriate components for the clock.
Requirements:
Minimum Frequency (3x max input signal frequency): 2MHz
Maximum Frequency (slower than worst case propagation delay path + setup time): 18MHz
Nominal Frequency: 10MHz - seems reasonable but open to discussion
Voltage: 5V CMOS (driving clock inputs of CD74AC175 and CD74AC109), I think?
Fanout: Qty. (11) CD74AC175 + Qty (3) CD74AC109
I see these are crystals (XTAL) and oscillators (
-Mike
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